hdu1535 SPFA

2边SPFA 然后求和

#include<stdio.h>
#include<string.h>
#include<queue>
#define INF 1000000000
#define ii __int64
using namespace std;
struct node
{
    ii v;
    ii val;
    ii next;
}edge1[1000003],edge2[1000003];
ii head1[1000003],dis1[1000003],head2[1000003],dis2[1000003],vis[1000003];
ii n,m,t,index1,index2;
void add1(ii x,ii y,ii z)
{
    ii i,j;
    edge1[index1].v=y;
    edge1[index1].val=z;
    edge1[index1].next=head1[x];
    head1[x]=index1++;
}
void add2(ii x,ii y,ii z)
{
    ii i,j;
    edge2[index2].v=y;
    edge2[index2].val=z;
    edge2[index2].next=head2[x];
    head2[x]=index2++;
}
void SPFA1(ii u)
{
    ii i,j;
    memset(vis,0,sizeof(vis));
    queue<ii>q;
    for(i=1;i<=n;i++)
        dis1[i]=INF;
    dis1[u]=0;
    vis[u]=1;
    q.push(u);
    while(!q.empty())
    {
        ii v=q.front();
        q.pop();
        vis[v]=0;
        for(i=head1[v];i!=-1;i=edge1[i].next)
        {
            ii tmp=edge1[i].v;
            if(dis1[tmp]>dis1[v]+edge1[i].val)
            {
                dis1[tmp]=dis1[v]+edge1[i].val;
                if(!vis[tmp])
                {
                    q.push(tmp);
                    vis[tmp]=1;
                }
            }
        }
    }
}
void SPFA2(ii u)
{
    ii i,j;
    memset(vis,0,sizeof(vis));
    queue<ii>q;
    for(i=1;i<=n;i++)
        dis2[i]=INF;
    dis2[u]=0;
    vis[u]=1;
    q.push(u);
    while(!q.empty())
    {
        ii v=q.front();
        q.pop();
        vis[v]=0;
        for(i=head2[v];i!=-1;i=edge2[i].next)
        {
            ii tmp=edge2[i].v;
            if(dis2[tmp]>dis2[v]+edge2[i].val)
            {
                dis2[tmp]=dis2[v]+edge2[i].val;
                if(!vis[tmp])
                {
                    q.push(tmp);
                    vis[tmp]=1;
                }
            }
        }
    }
}
int main()
{
    ii i,j,t,m;
    scanf("%I64d",&t);
    while(t--)
    {
        scanf("%I64d%I64d",&n,&m);
        index1=index2=1;
        memset(dis1,0,sizeof(dis1));
        memset(head1,-1,sizeof(head1));
        memset(dis2,0,sizeof(dis2));
        memset(head2,-1,sizeof(head2));
        for(i=0;i<m;i++)
        {
            ii x,y,z;
            scanf("%I64d%I64d%I64d",&x,&y,&z);
            add1(x,y,z);
            add2(y,x,z);
        }

        SPFA1(1);

        /*for(i=1;i<=n;i++)
        printf("%d ",dis1[i]);
        printf("
");*/

        SPFA2(1);

        /*for(i=1;i<=n;i++)
        printf("%d ",dis2[i]);printf("
");*/

        ii ans=0;
        for(i=1;i<=n;i++)
        {
            ans+=dis1[i]+dis2[i];
        }
        printf("%I64d
",ans);
    }
}